package com.xxxx.mail;

import com.rabbitmq.client.Channel;
import com.xxxx.server.pojo.Employee;
import com.xxxx.server.pojo.MailConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.mail.MailProperties;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.stereotype.Component;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.IOException;
import java.util.Date;

/**
 * wsy 2021-11-26 10:51
 * 消息接收
 **/
@Component
public class MailReceive {

    private static final Logger LOGGER = LoggerFactory.getLogger(MailReceive.class);

    @Autowired
    private JavaMailSender javaMailSender;
    @Autowired
    private MailProperties mailProperties;
    @Autowired
    private TemplateEngine templateEngine;
    @Autowired
    private RedisTemplate redisTemplate;

    @RabbitListener(queues = MailConstants.MAIL_QUEUE_NAME)
    public void handler(Message message, Channel channel){
        Employee employee = (Employee) message.getPayload();
        MessageHeaders headers = message.getHeaders();
        // 消息序号
        long tag = (long) headers.get(AmqpHeaders.DELIVERY_TAG);
        // 消息ID
        String msgId = (String) headers.get("spring_returned_message_correlation");
        HashOperations hashOperations = redisTemplate.opsForHash();


        try {
            if (hashOperations.entries("mail_log").containsKey(msgId)){
                LOGGER.error("消息：{} 已经被消费",msgId);
                // 手动确认消息 tag 消息序号，是否多条确认
                channel.basicAck(tag,false);
            }
            MimeMessage msg = javaMailSender.createMimeMessage();
            MimeMessageHelper messageHelper = new MimeMessageHelper(msg);
            // 发件人
            messageHelper.setFrom(mailProperties.getUsername());
            // 收件人
            messageHelper.setTo(employee.getEmail());
            // 主题
            messageHelper.setSubject("入职欢迎邮件");
            // 发送日期
            messageHelper.setSentDate(new Date());
            // 邮件内容
            Context context = new Context();
            context.setVariable("name",employee.getName());
            context.setVariable("posName",employee.getPosition().getName());
            context.setVariable("joblevelName",employee.getJoblevel().getName());
            context.setVariable("deparmentName",employee.getDepartment().getName());
            // 获取模板引擎，并将值传进去
            String mail = templateEngine.process("mail", context);
            messageHelper.setText(mail,true);
            // 发送邮件
            javaMailSender.send(msg);
            LOGGER.info("邮件发送成功！");
            // 将消息ID存入redis中
            hashOperations.put("mail_log",msgId,"ok");
            // 手动确认消息
            channel.basicAck(tag,false);
        } catch (Exception e) {
            try {
                // 消息序号，多条确认=false，是否回到队列=true
                channel.basicNack(tag,false,true);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            e.printStackTrace();
        }
    }
}
